WO2019128405A1

WO2019128405A1 - Wireless charging and receiving apparatus, and wireless charging method and device

Info

Publication number: WO2019128405A1
Application number: PCT/CN2018/111105
Authority: WO
Inventors: 武志贤; 刘彦丁; 王平华
Original assignee: 华为技术有限公司
Priority date: 2017-12-29
Filing date: 2018-10-19
Publication date: 2019-07-04
Also published as: CN109995098A; CN109995098B

Abstract

A wireless charging and receiving apparatus, and a wireless charging method and device. The apparatus comprises: at least one set of receiving coils, a compensation network groups, a rectifier circuit, a switch assembly and a controller; the compensation network groups comprise n compensation network groups, the n compensation network groups are different in circuit topological structure and/or device configuration parameters, input ends of each compensation network group are connected to output ends of the receiving coils, and output ends of each compensation network group are connected to an input end of the rectifier circuit, n being an integer greater than one; and the controller is used to control the switch assembly to connect one or more of the n compensation networks groups to the receiving coils and the rectifier circuit, so as to select different charging modes. According to the solution provided in the embodiments of the present application, multiple compensation network groups are designed in the wireless charging and receiving device, so that a plurality of different charging modes are supported thereby, the wireless charging modes are enriched, and the actual charging requirements are better met.

Description

Wireless charging receiving device, wireless charging method and device

The present application claims the priority of the Chinese Patent Application No. PCT Application No. No. No. No. No. No. No. No. No. No. No. No. .

Technical field

The embodiments of the present invention relate to the field of wireless charging technology, and in particular, to a wireless charging receiving device, a wireless charging method, and a device.

Background technique

The wireless charging technology refers to a technology in which a magnetic field is transmitted between a charger and a powered device, and no electrical connection is required between the two, so that the charging device can be charged. Wireless charging technology has been applied in electrical equipment such as mobile phones, smart watches, electric vehicles and the like.

At present, wireless charging is relatively simple and does not meet the actual charging requirements.

Summary of the invention

The embodiment of the present application discloses a wireless charging receiving device, a wireless charging method, and a device, which can be used to solve the problem that the existing wireless charging mode is relatively simple and cannot meet the actual charging requirement well.

In one aspect, an embodiment of the present application provides a wireless charging receiving apparatus, the apparatus comprising: at least one set of receiving coils, a compensation network group, a rectifier circuit, a switch component, and a controller. The compensation network group includes n sets of compensation networks, and the n sets of compensation networks are different in circuit topology and/or device configuration parameters, and the input ends of each group of compensation networks are connected to the output ends of the receiving coils, and the output ends of each group of compensation networks are The input terminals of the rectifier circuit are connected, and n is an integer greater than one. The controller is configured to control the switch assembly to conduct one or more of the n sets of compensation networks with the receive coil and the rectifier circuit to achieve selection of different charging modes.

In the solution provided by the embodiment of the present application, by designing multiple sets of compensation networks in the wireless charging receiving device, it supports a plurality of different charging modes, enriches the wireless charging mode, and better satisfies the actual charging demand.

Optionally, the number of the at least one set of receiving coils is a group, each group includes at least one coil, and a is a positive integer. In one possible design, 1 ≤ a < n, there are at least two sets of compensation network inputs connected to the output of the same set of receive coils. In another possible design, a = n, the input of each set of compensation networks is connected to the output of a set of receive coils, and different compensation networks are connected to different receive coils.

When multiple sets of compensation networks multiplex the same set of receiving coils, it helps to simplify the circuit topology, reduce the circuit size, and save circuit cost.

Optionally, the first receiving coil is included in the group a receiving coil, and the first receiving coil is connected to the first compensation network in the n groups of compensation networks. In one possible design, the first receiving coil is a single coil, and the first end and the second end of the first receiving coil are respectively connected to the input end of the first compensation network. In another possible design, the first receiving coil includes a first coil, a second coil, and a third coil, and the first end of the first coil and the second end of the third coil are connected to the first node, the first coil The first end of the second end and the second coil are connected to the second node, and the second end of the second coil is connected to the first end of the third coil to the third node, and the first node, the second node and the third node respectively Connected to the input of the first compensation network. In still another possible design, the first receiving coil includes a first coil, a second coil, and a third coil, and the first end of the first coil, the first end of the second coil, and the first end of the third coil are connected to The same node, the second end of the first coil, the second end of the second coil, and the second end of the third coil are respectively connected to the input end of the first compensation network.

For the receiving coil, the embodiment of the present application provides a plurality of structures such as a single coil and a multi-coil. In practical applications, a suitable coil structure can be selected according to actual needs.

Optionally, the number of rectifier circuits is group b, and b is a positive integer. In one possible design, 1 ≤ b < n, there are at least two sets of compensation network outputs connected to the input of the same rectifier circuit. In another possible design, b = n, the output of each set of compensation networks is connected to the input of a set of rectifier circuits, and different compensation networks are connected to different rectifier circuits.

When multiple sets of compensation networks multiplex the same rectifier circuit, it helps to simplify the circuit topology, reduce the circuit size, and save circuit cost.

In one possible design, the apparatus further includes a DC voltage conversion circuit, the input of the DC voltage conversion circuit being coupled to the output of the rectifier circuit.

In the solution provided by the embodiment of the present application, the output voltage is accurately controlled at the receiving end by providing a DC voltage conversion circuit at the receiving end.

In one possible design, the second compensation network is included in the n sets of compensation networks. The second compensation network includes k compensation network elements that are connected in parallel with each other, and k is an integer greater than one.

In the solution provided by the embodiment of the present application, when the compensation network adopts a parallel structure composed of multiple compensation network units, the working requirements of the single compensation network unit can be effectively reduced, and multiple compensation network unit access can be flexibly selected to achieve effective Power reception.

In one possible design, the switch assembly includes a first switch. The first switch is an electronic switch; or the first switch is a mechanical switch; or the first switch includes a parallel electronic switch and a mechanical switch.

On the other hand, an embodiment of the present application provides a wireless charging method, which is applied to a controller of a wireless charging receiving apparatus according to the above aspect, the method includes: acquiring charging demand information; determining, to be enabled, according to charging demand information The charging mode; from the n sets of compensation networks, selecting a first target compensation network corresponding to the charging mode to be activated; and controlling the switch component to conduct the first target compensation network with the receiving coil and the rectifying circuit.

In the solution provided by the embodiment of the present application, the charging mode to be enabled is determined according to the charging requirement information, and then the compensation network access corresponding to the charging mode to be activated is selected, and the charging mode is adaptively selected according to the requirement to perform wireless charging. The technical effect of charging.

In a possible design, the control switch component turns on the first target compensation network and the receiving coil and the rectifying circuit, and further includes: determining the adjusted charging mode according to the charging state; selecting and adjusting from the n groups of compensation networks a second target compensation network corresponding to the charging mode; the control switch component turns on the second target compensation network and the receiving coil and the rectifying circuit.

In the solution provided by the embodiment of the present application, the charging mode is adjusted by combining the charging states during the charging process to achieve higher efficiency wireless charging.

In another aspect, an embodiment of the present application provides an electrical device, including: a battery, and the wireless charging receiving device according to the above aspect.

DRAWINGS

1 is a schematic diagram of a wireless charging system provided by an embodiment of the present application;

2 is a schematic structural diagram of a wireless charging and receiving apparatus according to an embodiment of the present application;

Figure 3 exemplarily shows a circuit topology diagram of several compensation networks;

4 is a schematic structural diagram of a wireless charging and receiving apparatus according to another embodiment of the present application;

FIG. 5 is a schematic structural diagram of a wireless charging and receiving apparatus according to another embodiment of the present application; FIG.

6 is a schematic structural diagram of a wireless charging and receiving apparatus according to another embodiment of the present application;

FIG. 7 is a schematic structural diagram of a wireless charging and receiving apparatus according to another embodiment of the present application; FIG.

FIG. 8 is a schematic structural diagram of a wireless charging and receiving apparatus according to another embodiment of the present application;

FIG. 9 is a schematic structural diagram of a wireless charging and receiving apparatus according to another embodiment of the present application;

FIG. 10 is a schematic structural diagram of a wireless charging and receiving apparatus according to another embodiment of the present application;

FIG. 11 is a schematic structural diagram of a wireless charging and receiving apparatus according to another embodiment of the present application;

FIG. 12 is a schematic structural diagram of a wireless charging and receiving apparatus according to another embodiment of the present application;

FIG. 13 is a schematic structural diagram of a wireless charging and receiving apparatus according to another embodiment of the present application; FIG.

FIG. 14 is a circuit topology diagram of a wireless charging and receiving apparatus according to another embodiment of the present application; FIG.

15 is a circuit topology diagram of a wireless charging and receiving apparatus according to another embodiment of the present application;

16 is a circuit topology diagram of a wireless charging and receiving apparatus according to another embodiment of the present application;

17 is a circuit topology diagram of a wireless charging and receiving apparatus according to another embodiment of the present application;

FIG. 18 is a circuit topology diagram of a wireless charging and receiving apparatus according to another embodiment of the present application; FIG.

19 is a flowchart of a wireless charging method provided by an embodiment of the present application;

20 is a circuit topology diagram of a wireless charging and receiving apparatus according to another embodiment of the present application;

Figure 21 shows a flow chart of a control strategy;

22 is a circuit topology diagram of a wireless charging and receiving apparatus according to another embodiment of the present application;

Figure 23 shows a flow chart of another control strategy;

24 is a flowchart of a wireless charging method according to another embodiment of the present application;

Figure 25 shows a flow chart of another control strategy;

FIG. 26 is a schematic block diagram of a powered device provided by an embodiment of the present application.

Detailed ways

In order to make the objects, technical solutions and advantages of the present application more clear, the embodiments of the present application will be further described in detail below with reference to the accompanying drawings.

The system architecture and the service scenario described in the embodiments of the present application are for the purpose of more clearly illustrating the technical solutions of the embodiments of the present application, and do not constitute a limitation of the technical solutions provided by the embodiments of the present application. The technical solutions provided by the embodiments of the present application are equally applicable to similar technical problems.

Please refer to FIG. 1 , which shows a schematic diagram of a wireless charging system provided by an embodiment of the present application. The wireless charging system may include a wireless charging transmitting device 10 and a wireless charging receiving device 20.

The wireless charging transmitting device 10 may include a DC power supply circuit 11, an inverter circuit 12, a compensation network 13, a transmitting coil 14, and a controller 15.

The DC power supply circuit 11 is for supplying a DC power supply, the input end of the DC power supply circuit 11 is in communication with the power grid, and the power supply is supplied to the DC power supply circuit 11. The DC power supply circuit 11 can take many forms, such as a battery, or a combination of an AC power source and a conversion circuit that converts AC power to DC power. The inverter circuit 12 is for converting direct current into alternating current, for example, converting a direct current voltage supplied from the direct current power supply circuit 11 into an alternating current voltage. The compensation network 13 may be referred to as a transmitter compensation network, the role of which is to compensate for the impedance of the transmitting end such that the equivalent impedance of the transmitting end exhibits the desired characteristics. The transmitting coil 14 is used to transmit an alternating electromagnetic field. The controller 15 may be referred to as a transmitter controller for adjusting the operating frequency of the inverter circuit 12, controlling the output voltage and current of the inverter circuit 12, and the like, for example, controlling the inverter circuit 12 to output high frequency alternating current.

The wireless charging receiving device 20 may include a receiving coil 21, a compensation network group 22, a rectifying circuit 23, a switch assembly 24, and a controller 25.

The receiving coil 21 is disposed corresponding to the transmitting coil 14 for receiving the electromagnetic field energy emitted by the transmitting coil 14, and generating an electrical signal (current or voltage) in the receiving coil 21. In the embodiment of the present application, the number of receiving coils 21 may be at least one group, and each group of receiving coils 21 includes at least one coil. The compensation network group 22 may be referred to as a receiver compensation network group, and its function is to compensate the impedance of the receiving end such that the equivalent impedance of the receiving end exhibits a desired characteristic. In the embodiment of the present application, the compensation network group 22 includes multiple sets of compensation networks, and different compensation networks correspond to different charging modes. The rectifier circuit 23 is for converting alternating current into direct current. Switch assembly 24 is used to select any set of compensation networks to be conductive to receive coil 21 and rectifier circuit 23. The controller 25 may be referred to as a receiving end controller for selecting a charging mode, switching a compensation network, controlling an output voltage and current of the rectifying circuit 23, etc., to meet the demand of the load. In addition, information exchange between the controller 15 at the transmitting end and the controller 25 at the receiving end may be performed by wireless communication.

The wireless charging system provided by the embodiment of the present application is applicable to any scene with wireless charging requirements, such as a wireless charging scene of a terminal device such as a mobile phone or a smart watch, and a wireless charging scene of an electric vehicle.

Please refer to FIG. 2 , which is a schematic structural diagram of a wireless charging and receiving device 20 according to an embodiment of the present application. The wireless charging receiving device 20 may include at least one set of receiving coils 21, a compensation network group 22, a rectifying circuit 23, a switch assembly 24, and a controller 25.

The receiving coil 21 is for receiving electromagnetic field energy emitted from the transmitting end and generating an electrical signal (current or voltage) in the receiving coil 21.

The compensation network group 22 includes n sets of compensation networks, n being an integer greater than one. The compensation network 1, the compensation network 2, ..., the compensation network n, and the like as shown in FIG. The input of each set of compensation networks is connected to the output of the receiving coil 21, and the output of each set of compensation networks is connected to the input of the rectifier circuit 23.

As already explained above, the role of the compensation network is to compensate the impedance of the receiving end such that the equivalent impedance of the receiving end exhibits the desired characteristics. The compensation network is usually composed of inductors and/or capacitors of different combinations and different connections. In the embodiment of the present application, the n sets of compensation networks are different in circuit topology and/or device configuration parameters. Among them, the circuit topology is determined by the variety, combination and connection mode of the circuit components included in the circuit. The variety of circuit components refers to the types of circuit components included in the compensation network, such as inductors, capacitors or other types of circuit components. The combination of circuit components refers to the combination of the types and the number of circuit components in the compensation network. For example, some compensation networks include one capacitor, and some compensation networks include one capacitor and one inductor. The compensation network includes 2 capacitors, and so on. The connection manner of the circuit components refers to the connection manner between the various circuit components included in the compensation network, and the connection manner between the circuit components and the receiving coil 21, the rectifier circuit 23 or other components at the receiving end. The device configuration parameters refer to the configuration parameters of the circuit components included in the compensation network, such as the capacity of the capacitor, the inductance of the inductor, etc. Under normal circumstances, different types of circuit components have different configuration parameters.

Since the characteristics of the circuit components included in different compensation networks are different, different compensation networks may correspond to different charging modes. The charging mode can be divided into different dimensions such as charging time, charging degree of freedom, transmitting power, transmitting mode, and operating frequency. Illustratively, reference is made to Table 1 below, which shows several different charging modes:

Table 1

Taking the charging mode according to the charging time as an example, it can be divided into three different charging modes: fast charging mode, standard charging mode and slow charging mode; wherein the fast charging mode only needs 30-60 minutes (minutes) to be fully charged. For example, only 30, 40, 50 or 60 minutes, the standard charging mode needs 60-300min full, for example 60, 100, 200 or 300min, and the slow charging mode needs 300-600min full, for example 300, 400, 500 or 600. In other examples, the charging mode is divided according to the charging time as an example, and the charging mode can be divided into two different charging modes: the fast charging mode and the standard charging mode; wherein the fast charging mode only needs 30-60 minutes to be fully charged, and the standard charging is performed. The mode needs to be filled for more than 60 minutes. It should be noted that the above charging mode is divided into exemplary and explanatory forms, and does not limit the technical solution of the present application.

In addition, please refer to FIG. 3, which shows a circuit topology diagram of several commonly used compensation networks. The types and characteristics of each compensation network are shown in Table-2 below:

Table 2

A controller 25 is provided for controlling the switch assembly 24 to conduct one or more of the n sets of compensation networks with the receive coil 21 and the rectifying circuit 23 to effect selection of different charging modes.

Since different compensation networks can support different charging modes, the selection of different charging modes can be achieved by the controller 25 controlling the switching component 24 to select to switch on different compensation networks. In one example, after the controller 25 selects the charging mode, the control switch component 24 conducts one or more sets of compensation networks corresponding to the selected charging mode with the receiving coil 21 and the rectifier circuit 23, the wireless charging process. Start. For example, when the compensation network 1 is selected for access, the control switch group 1 is closed, and the other switch groups are turned off, so that the compensation network 1 is turned on with the receiving coil 21 and the rectifying circuit 23. The process for the controller 25 to select the charging mode and the compensation network will be described in detail in the following embodiments. It should be noted that one charging mode generally corresponds to a set of compensation networks, but may also correspond to multiple sets of compensation networks, for example, when a certain charging mode corresponds to the two compensation networks of

compensation networks

1 and 2, if control The controller 25 decides to select the charging mode, and the controller 25 controls the switching component 24 to simultaneously turn the

compensation networks

1 and 2 into the receiving coil 21 and the rectifying circuit 23.

The output of the rectifier circuit 23 is connected to a load such as a battery. The rectifying circuit 23 is for converting the AC electric signal received by the compensated receiving coil 21 into a DC voltage required for the load. The rectifier circuit 23 may be an uncontrollable circuit composed of a diode, or may be a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) or an Insulated Gate Bipolar Transistor (Insulated Gate Bipolar Transistor). The controllable circuit composed of a controllable switch such as IGBT) may also be a half control circuit composed of a thyristor or a half control circuit composed of a combination of a controllable switch and an uncontrollable switch.

Optionally, the switch assembly 24 includes a plurality of switches that are controllable switches that can be opened and closed by external drive control. Illustratively, the switch assembly 24 includes a first switch, and the first switch can be any one of the switches included in the switch assembly 24. In one example, the first switch can be an electronic switch, such as a MOSFET, an IGBT, etc., and the instantaneous characteristics of the electronic switch are good. In another example, the first switch can also be a mechanical switch, such as a relay, a contactor, etc., with a small conduction loss of the mechanical switch. In yet another example, the first switch includes a parallel electronic switch and a mechanical switch to simultaneously utilize the characteristics of the electronic switch with good transient characteristics and small mechanical switch conduction loss to avoid opening or closing with a mechanical switch in the case of a large current. The phenomenon of arcing occurs. In practical applications, various factors such as the size of the load, the allowable conduction loss, and the allowable switching speed can be combined to select a suitable switch after comprehensive consideration.

Optionally, the controller 25 has at least one of the following functions in addition to the control functions described above: a detection function, a protection function, an alarm function, a display function, and the like. The detecting function is used for detecting parameters such as voltage and current in the receiving end circuit, including detecting the voltage across the receiving coil 21, the current flowing in the receiving coil 21, the voltage output by the rectifying circuit 23, the current output by the rectifying circuit 23, and the compensation. The voltage in the network, the current in the compensation network, and so on. Optionally, the detection function is also used to detect signals required for control and protection at the receiving end. The protection function is used to protect the circuit of the receiving end, the components of the circuit, and the load, such as overvoltage protection, overcurrent protection, and overheat protection. The alarm function is used to issue an alarm when an abnormality such as a short circuit, overvoltage, or overheating occurs. The display function is used to display information related to the charging process, such as charging mode, battery power, charging time and other information.

In the solution provided by the embodiment of the present application, by designing multiple sets of compensation networks in the wireless charging receiving device 20, it supports a plurality of different charging modes, enriches the wireless charging mode, and better satisfies the actual charging demand.

Alternatively, it is assumed that the number of receiving coils 21 is a group, and a is a positive integer.

In one example, 1 ≤ a < n, there are at least two sets of compensation network inputs connected to the output of the same set of receive coils, that is, there are at least two sets of compensation networks multiplexing the same set of receive coils. Exemplarily, as shown in FIG. 4, assuming that n=3 and a=2, the input end of the compensation network 1 and the input end of the compensation network 2 are both connected to the output end of the receiving coil L1, and the input and receiving of the compensation network 3 are received. The output of the coil L2 is connected.

Optionally, when a=1, the input ends of the n sets of compensation networks are connected to the outputs of the same set of receiving coils, that is, the n sets of compensation networks multiplex the same set of receiving coils. Illustratively, as shown in FIG. 5, assuming n=3 and a=1, the input of the compensation network 1, the input of the compensation network 2 and the input of the compensation network 3 are all connected to the output of the receiving coil L1.

In another example, a = n, the input of each set of compensation networks is connected to the output of a set of receive coils, and different compensation networks are connected to different receive coils. Illustratively, as shown in FIG. 6, assuming n=3 and a=3, the input end of the compensation network 1 is connected to the output end of the receiving coil L1, and the input end of the compensation network 2 is connected to the output end of the receiving coil L2, and compensation The input of the network 3 is connected to the output of the receiving coil L3.

Optionally, the a group of receiving coils includes a first receiving coil, and the first receiving coil is any one of a group of receiving coils. The first receiving coil is connected to the first compensation network in the n groups of compensation networks, and the first compensation network is any one of the n groups of compensation networks.

In one example, the first receiving coil is a single coil, and the first end and the second end of the first receiving coil are respectively coupled to the input of the first compensation network. For example, in the circuit topology diagram shown in FIG. 4, both the receiving coil L1 and the receiving coil L2 are single coils. The first and second ends of the receiving coil L1 are connected to the input of the compensation network 1 and to the input of the compensation network 2. The first end and the second end of the receiving coil L2 are connected to the input of the compensation network 3.

In another example, the first receiving coil includes a first coil, a second coil, and a third coil. The first end of the first coil and the second end of the third coil are connected to the first node, the second end of the first coil and the first end of the second coil are connected to the second node, and the second end of the second coil is The first end of the third coil is connected to the third node, and the first node, the second node and the third node are respectively connected to the input end of the first compensation network. For example, in the circuit topology diagram shown in FIG. 7, the first receiving coil includes a first coil L1, a second coil L2, and a third coil L3, and the three coils are connected to form a triangular structure. The first node, the second node and the third node of the first receiving coil are connected to the input of the compensation network 1 and to the input of the compensation network 2. The compensation network 1 and the compensation network 2 are three inputs and three outputs, and the corresponding rectifier circuit 23 is also three inputs.

In still another example, the first receiving coil includes a first coil, a second coil, and a third coil, and the first end of the first coil, the first end of the second coil, and the first end of the third coil are connected to the same node The second end of the first coil, the second end of the second coil, and the second end of the third coil are respectively connected to the input end of the first compensation network. For example, in the circuit topology diagram shown in FIG. 8, the first receiving coil includes a first coil L1, a second coil L2, and a third coil L3, and the three coils are connected to form a star structure. The second end of the first coil L1, the second end of the second coil L2, and the second end of the third coil L3 are connected to the input of the compensation network 1 and to the input of the compensation network 2. The compensation network 1 and the compensation network 2 are three inputs and three outputs, and the corresponding rectifier circuit 23 is also three inputs.

In the solution provided by the embodiment of the present application, when multiple sets of compensation networks multiplex the same set of receiving coils, it helps to simplify the circuit topology, reduce the circuit volume, and save circuit cost. Moreover, for the receiving coil 21, the embodiment of the present application provides a plurality of structures such as a single coil and a multi-coil. In practical applications, a suitable coil structure can be selected according to actual needs.

Alternatively, it is assumed that the number of the rectifying circuits 23 is b group, and b is a positive integer.

In one example, 1 ≤ b < n, there are at least two sets of compensation network outputs connected to the input of the same rectifier circuit, that is, there are at least two sets of compensation networks multiplexed with the same rectifier circuit. Illustratively, as shown in FIG. 9, assuming that n=3 and b=2, the output of the compensation network 1 and the output of the compensation network 2 are both connected to the input of the rectifier circuit 23(a), compensating for the output of the network 3. The terminal is connected to the input terminal of the rectifier circuit 23(b).

Optionally, when b=1, the output ends of the n sets of compensation networks are connected to the input ends of the same rectifier circuit, that is, the n sets of compensation networks multiplex the same rectifier circuit. Illustratively, as shown in FIG. 10, assuming that n=3 and b=1, the output of the compensation network 1, the output of the compensation network 2, and the output of the compensation network 3 are all connected to the input of the rectifier circuit 23.

In another example, b = n, the output of each set of compensation networks is connected to the input of a set of rectifier circuits, and different compensation networks are connected to different rectifier circuits. Illustratively, as shown in FIG. 11, assuming that n=3 and b=3, the output of the compensation network 1 is connected to the input of the rectifier circuit 23(a), and the output of the compensation network 2 and the rectifier circuit 23(b) The inputs are connected and the output of the compensation network 3 is connected to the input of the rectifier circuit 23(c).

In the solution provided by the embodiment of the present application, when multiple sets of compensation networks multiplex the same rectifier circuit, it helps to simplify the circuit topology, reduce the circuit volume, and save circuit cost.

Optionally, as shown in FIG. 12, the wireless charging receiving device 20 further includes a DC voltage converting circuit 26. The input of the DC voltage conversion circuit 26 is connected to the output of the rectifier circuit 23. The DC voltage conversion circuit 26 is for controlling the output voltage to convert the DC voltage output from the rectifier circuit 23 into a DC voltage required for the load. The type of the DC voltage conversion circuit 26 may be a boost type, a buck type, or a buck-boost type. For example, the boost type DC voltage converting circuit 26 may be a boost circuit, and the step-down DC voltage converting circuit 26 may be a buck circuit.

In the solution provided by the embodiment of the present application, the output voltage is accurately controlled at the receiving end by providing the DC voltage conversion circuit 26 at the receiving end.

Optionally, the n compensation network includes a second compensation network, and the second compensation network is any one of the n compensation networks. The second compensation network includes k compensation network elements that are connected in parallel with each other, and k is an integer greater than one. The circuit topology of the k compensation network units may be the same or different, and the circuit topology of each of the compensation network units may be any one of the structures shown in FIG. 3 or other structures. Optionally, each of the compensation network units is correspondingly provided with a set of switches, and the controller 25 controls the number of the compensated network units to be accessed by controlling the switches to open and close. When the number of compensated network elements that are accessed is different, the received power also changes.

Illustratively, as shown in FIG. 13, the compensation network group 22 includes two sets of compensation networks, denoted as the compensation network 1 and the compensation network 2. The compensation network 1 includes k compensation network units that are connected in parallel with each other, such as compensation network unit 1-1, compensation network unit 1-2, compensation network 1-k, etc.; compensation network 2 includes k pairs of two Compensation network units that are connected in parallel with each other, such as compensation network unit 2-1, compensation network unit 2-2, compensation network 2-k, and the like. Each of the compensation network units is correspondingly provided with a switch group for controlling whether the compensation network unit is connected to the receiving coil 21 and the rectifier circuit 23 or not.

The circuit topology of the wireless charging receiving device 20 provided by the embodiment of the present application is exemplified in the following with reference to a specific example.

As shown in FIG. 14, the receiving coil 21 is Ls. The compensation network group 22 includes a compensation network 1 and a compensation network 2, and the compensation network 1 and the compensation network 2 are both single-capacitor structures. The compensation network 1 includes a capacitor C1, and the compensation network 2 includes a capacitor C2. The switch assembly 24 includes a switch block S1 and a switch block S2. The rectifier circuit 23 includes diodes D1, D2, D3, and D4. The capacitor Co acts as a filter to filter out high frequency ripple in the DC voltage.

The wireless charging receiving device 20 supports two different charging modes, namely, charging mode 1 and charging mode 2.

When the charging mode 1 is selected, as shown in FIG. 14, the controller 25 controls the switch group S1 to be closed, and the control switch group S2 is turned on, the receiving coil Ls is connected in series with the capacitor C1 of the compensation network 1, and the receiving coil Ls and the capacitor C1 are generated during charging. In series resonance, the resonant voltage converts the high frequency alternating current signal into a direct current signal through the rectifying circuit 23, and then filters it through the capacitor Co, and the filtered voltage supplies power to the load.

When the charging mode 2 is selected, as shown in FIG. 15, the controller 25 controls the switch group S1 to be turned on, and the control switch group S2 is closed, the receiving coil Ls is connected in parallel with the capacitor C2 of the compensation network 2, and the receiving coil Ls and the capacitor C2 are generated during charging. In parallel resonance, the resonant voltage converts the high-frequency alternating current signal into a direct current signal through the rectifying circuit 23, and then filters it through the capacitor Co, and the filtered voltage supplies power to the load.

When operating in the charging mode 1, the receiving coil Ls is in series resonance with the capacitor C1 of the compensation network 1, the circuit operates in the voltage source mode, and outputs the main control voltage, which is more suitable for the fast charging mode; when operating in the charging mode 2, the receiving coil Ls resonates in parallel with the capacitor C2 of the compensation network 2. The circuit operates in the current source mode and outputs the main control current, which is more suitable for the standard charging mode or the slow charging mode.

The wireless charging receiving device 20 shown in FIGS. 14 and 15 above supports two different charging modes, and two different charging modes multiplex the same receiving coil Ls and the rectifying circuit 23, thereby effectively reducing the circuit volume and saving circuit cost.

Optionally, as shown in FIG. 16, the output end of the rectifier circuit 23 may also be connected to the DC voltage conversion circuit 26 to improve the voltage adaptive adjustment function of the receiving end. Taking the DC voltage conversion circuit 26 as a Boost boost circuit as an example, the inductor Lo, the diode Do, and the switch transistor Qo are used. The Boost boost circuit is used to adjust the voltage output from the rectifier circuit 23, and can perform boost control. The above-mentioned FIG. 16 is only described by taking a Boost boost circuit as an example. In practical applications, a Buck step-down circuit or a Boost-Buck buck-boost circuit can be used, which can be selected according to actual needs.

Alternatively, in the wireless charging receiving device 20 shown in Figs. 14 and 15, a diode is selected in the rectifying circuit 23. In the wireless charging receiving device 20 shown in FIG. 17, the switching circuit is selected in the rectifying circuit 23, including the switching tubes Q1, Q2, Q3 and Q4, which can effectively improve the voltage adaptive adjustment function of the receiving end. Specifically, the diode is an uncontrollable switch, so it can only function as a rectification, and the switch tube is a controllable switch, and the timing of turning on and off the switch tubes Q1, Q2, Q3, and Q4 through the controller 25 can be The voltage amplitude is adjusted during the rectification process, that is, the voltage on the output load can be controlled by the continuous on-off combination of the switches Q1, Q2, Q3 and Q4. The above manner enables the circuit of the receiving end to be smaller in size than the output voltage is controlled by adding the DC voltage converting circuit 26 at the receiving end.

Optionally, as shown in FIG. 18, when the receiving coil 21 includes the first coil L1, the second coil L2, and the third coil L3, and the three coils are connected to form a triangular structure, the number of capacitors included in the compensation network and the coil are The number is the same, and the rectifier circuit 23 is also changed from the two bridge arms to the three bridge arms.

Please refer to FIG. 19, which is a flowchart of a wireless charging method provided by an embodiment of the present application. This method can be applied to the controller 25 of the wireless charging receiving device 20 introduced in the above embodiment. The method can include the following steps:

Step 301: Acquire charging demand information.

The charging demand information refers to information for reflecting the user's charging demand, such as charging time, charging voltage, charging power, charging cost, and the like. The controller 25 can obtain charging demand information according to the state of the wireless charging system, the state of the load (such as a battery), user interaction input, user habits, environmental conditions, and the like.

Step 302: Determine a charging mode to be activated according to the charging demand information.

Optionally, the controller 25 determines a charging mode corresponding to the charging requirement information in the preset correspondence relationship as a charging mode to be activated, where the preset correspondence relationship includes a correspondence relationship between the charging demand information and the charging mode. For example, the wireless charging system supports three charging modes: fast charging, standard charging, and slow charging. The preset correspondence includes the correspondence shown in Table-3 below:

充电模式Charging mode	充电需求信息(充电时间)Charging demand information (charging time)
快速充电模式Fast charging mode	30-60min充满30-60min full
标准充电模式Standard charging mode	60-300min充满60-300min full
慢速充电模式Slow charging mode	300-600min充满300-600min full

table 3

Assuming that the charging demand information acquired by the controller 25 is full of the battery within 60 minutes, the controller 25 determines that the charging mode to be activated is the fast charging mode according to the preset correspondence relationship shown in Table-3 above.

Step 303: From the n sets of compensation networks, select a first target compensation network corresponding to the charging mode to be enabled.

After the controller 25 determines the charging mode to be activated, the compensation network corresponding to the charging mode to be activated is acquired according to the correspondence table between the charging mode and the compensation network set in advance (referred to as “first target compensation network”). .

In step 304, the control switch component 24 turns on the first target compensation network with the receiving coil 21 and the rectifier circuit 23.

After selecting the first target compensation network, the controller 25 controls the switch component 24 to conduct the first target compensation network with the receiving coil 21 and the rectifier circuit 23, and the wireless charging process begins.

In one example, taking the wireless charging scenario of an electric vehicle as an example, as shown in FIG. 20, the wireless charging receiving device 20 is compatible with two output power levels of 7 kW and 100 kW. The 7kW output power level corresponds to the standard charging mode, and the 100kW output power level corresponds to the fast charging mode. The wireless charging receiving device 20 includes a receiving coil Ls, a compensation network 1, a compensation network 2, a switch group S1, a switch group S2, a rectifier circuit 23, a filter capacitor Co, and a controller 25. The switch group S1 controls the compensation network 1 to access, and the switch group S2 controls the compensation network 2 to access.

The compensation network 1 supports wireless charging with an output power of 7 kW, which satisfies the SAE J2954 standard, and has a working vertical distance range of 10-25 cm and an operating frequency range of 81.38-90 kHz. The compensation network 1 adopts a double-capacitor single-inductance structure, including capacitors C1, C2 and an inductor Lf. The structure has a current source characteristic, and even if the load is short-circuited, it does not cause a fault, so the stability of the system is excellent.

The compensation network 2 supports wireless charging with an output power of 100 kW, a working vertical distance range of less than 10 cm, and an operating frequency range of 20-40 kHz. The compensation network 2 adopts a single capacitor structure, including a capacitor C3. The structure has the advantages of simple structure and small number of components, and is suitable for use in a fast charging mode.

Illustratively, as shown in Table 4 below, it shows optional configuration parameters for the compensation network 1 and the compensation network 2:

Table 4

As shown in Figure 21, it shows the corresponding control strategy. The controller 25 acquires charging demand information and identifies the charging demand information. If the required charging power is less than 7 kW, the standard charging mode is selected, and the compensation network corresponding to the standard charging mode is determined to be the compensation network 1, the controller 25 controls the switch group S1 to be closed and the switch group S2 is turned off, so that the compensation network 1 and the receiving coil The Ls and the rectifier circuit 23 are turned on to start wireless charging. If the required charging power is greater than 7 kW, the fast charging mode is selected, and the compensation network corresponding to the fast charging mode is determined to be the compensation network 2, the controller 25 controls the switch group S1 to be turned off and the switch group S2 is closed, so that the compensation network 2 and the receiving coil The Ls and the rectifier circuit 23 are turned on to start wireless charging. After the wireless charging begins, the system charges in the selected charging mode until the end of charging.

In another example, taking a wireless charging scenario of a terminal device such as a mobile phone as an example, as shown in FIG. 22, the wireless charging receiving device 20 is compatible with two charging standards of Qi and A4WP. The Qi charging standard corresponds to the magnetic induction charging mode, and the A4WP charging standard corresponds to the magnetic resonance charging mode. The wireless charging receiving device 20 includes a receiving coil Ls, a compensation network 1, a compensation network 2, a switch group S1, a switch group S2, a rectifier circuit 23, a filter capacitor Co, and a controller 25. The switch group S1 controls the compensation network 1 to access, and the switch group S2 controls the compensation network 2 to access.

The compensation network 1 supports the wireless charging of the Qi standard, and the transmitting coil and the receiving coil are closely attached, and the operating frequency ranges from 110 to 205 kHz. The compensation network 1 adopts a single capacitor structure including a capacitor C1. The compensation network 2 supports the wireless charging of the A4WP standard, and the working vertical distance range is less than 2 cm, and the operating frequency is 6.78 MHz. The compensation network 2 adopts a single capacitor structure including a capacitor C2.

Illustratively, as shown in Table-5 below, it shows optional configuration parameters for the compensation network 1 and the compensation network 2:

补偿网络Compensation network	类型Types of	器件参数Device parameter	开关组Switch group	工作频率working frequency	垂直距离vertical distance		充电模式Charging mode
11	单电容Single capacitor	C1＝78.2nFC1=78.2nF	S1S1	110-205kHz110-205kHz	0cm0cm	磁感应充电模式Magnetic induction charging mode
22	单电容Single capacitor	C3＝3.74nFC3=3.74nF	S2S2	6.78MHz6.78MHz	2cm2cm	磁共振充电模式Magnetic resonance charging mode

table 5

As shown in Figure 23, it shows the corresponding control strategy. The controller 25 acquires charging demand information and identifies the charging demand information. If the required charging standard is Qi, the magnetic induction charging mode is selected, and the compensation network corresponding to the magnetic induction charging mode is determined to be the compensation network 1, and the controller 25 controls the switch group S1 to be closed and the switch group S2 to be disconnected, so that the compensation network 1 and the receiving coil The Ls and the rectifier circuit 23 are turned on to start wireless charging. If the required charging standard is A4WP, the magnetic resonance charging mode is selected, and the compensation network corresponding to the magnetic resonance charging mode is determined to be the compensation network 2, and the controller 25 controls the switch group S1 to be turned off and the switch group S2 to be closed, so that the compensation network 2 and The receiving coil Ls and the rectifying circuit 23 are turned on to start wireless charging. After the wireless charging begins, the system charges in the selected charging mode until the end of charging.

It should be noted that due to different charging modes, the requirements for the vertical distance and alignment between the transmitting coil and the receiving coil are different, so after determining the selected charging mode, the transmitting coil and the receiving coil can be adjusted. Vertical distance, alignment, etc., to obtain a higher coupling coefficient.

In the solution provided by the embodiment of the present application, the charging mode to be activated is determined according to the charging requirement information, and then the compensation network access corresponding to the charging mode to be activated is selected, and the appropriate charging mode is adaptively selected according to the requirement. The technical effect of wireless charging.

In the embodiment shown in Fig. 19 described above, the charging mode is not changed during charging. In another embodiment provided by the embodiment of the present application, as shown in FIG. 24, the foregoing step 304 further includes the following steps:

Step 305, determining an adjusted charging mode according to the state of charge;

The state of charge may include parameters such as battery power, battery temperature, and the like. In one example, it is assumed that the charging mode includes a standard charging mode and a fast charging mode. When the battery power is between 20-80%, the corresponding charging mode is the fast charging mode, when the battery power is not between 20-80%, The corresponding charging mode is the standard charging mode.

Step 306: Select, from the n sets of compensation networks, a second target compensation network corresponding to the adjusted charging mode.

After determining the adjusted charging mode, the controller 25 acquires a compensation network corresponding to the adjusted charging mode according to a correspondence table between the preset charging mode and the compensation network (referred to as a “second target compensation network”). .

Step 307, the control switch component 24 turns on the second target compensation network with the receiving coil 21 and the rectifier circuit 23.

After selecting the second target compensation network, the controller 25 controls the switch component 24 to conduct the second target compensation network with the receiving coil 21 and the rectifier circuit 23, and controls the switch assembly 24 to connect the first target compensation network to the receiving coil 21 and rectify. Circuit 23 is disconnected and the wireless charging process continues.

Still taking the wireless charging scenario of the electric vehicle shown in FIG. 20 as an example, as shown in FIG. 25, it shows a corresponding control strategy. The controller 25 acquires charging demand information and identifies the charging demand information. If the required charging power is less than 7 kW, the standard charging mode is selected, and the compensation network corresponding to the standard charging mode is determined to be the compensation network 1, the controller 25 controls the switch group S1 to be closed and the switch group S2 is turned off, so that the compensation network 1 and the receiving coil The Ls and the rectifier circuit 23 are turned on to start wireless charging. If the required charging power is greater than 7 kW, the battery power is judged. If the battery power is less than 20%, the standard charging mode is selected, and the compensation network corresponding to the standard charging mode is determined to be the compensation network 1, and the controller 25 controls the switch group S1 to be closed. And the switch group S2 is turned off, so that the compensation network 1 is turned on with the receiving coil Ls and the rectifying circuit 23, and wireless charging is started. During the charging process, the controller 25 obtains the battery power in real time. When the battery power reaches 20%, the fast charging mode is selected, the compensation network corresponding to the fast charging mode is determined to be the compensation network 2, and the controller 25 controls the switch group S1 to be disconnected. The switch group S2 is closed, so that the compensation network 2 is electrically connected to the receiving coil Ls and the rectifying circuit 23 for wireless charging. The controller 25 continues to obtain the battery power. When the battery power reaches 80%, the standard charging mode is selected, and the compensation network corresponding to the standard charging mode is determined to be the compensation network 1. The controller 25 controls the switch group S1 to be closed and the switch group S2 to be disconnected. The compensation network 1 is turned on with the receiving coil Ls and the rectifying circuit 23, and wireless charging is continued until the battery is fully charged.

Referring to FIG. 26, an exemplary embodiment of the present application further provides a powered device 40. For example, the powered device 40 can be a mobile phone, a tablet, a wearable device, an electric car, or the like. The electric device 40 includes a battery 41 and a wireless charging receiving device 20. The battery 41 is a rechargeable battery such as a lithium ion battery, a lead storage battery, or the like. The wireless charging receiving device 20 can be the wireless charging receiving device 20 provided by any of the above embodiments. The output of the wireless charging receiving device 20 is connected to the battery 41 for charging the battery 41. The battery 41 serves as a power source for the electric device 40 for supplying power to the electric device 40. For example, when the powered device 40 is a mobile phone, the battery 41 is used to power a processor, a memory, and the like of the mobile phone. For another example, when the electric device 40 is an electric car, the battery 41 is used to supply power to components such as an engine of an electric car, an on-board computer, and the like.

The specific embodiments of the present invention have been described in detail with reference to the embodiments, technical solutions and advantages of the embodiments of the present application. It should be understood that the foregoing description is only The scope of the present invention is defined by the scope of the present invention, and any modifications, equivalents, improvements, etc., which are included in the embodiments of the present application, are included in the scope of protection of the embodiments of the present application.

Claims

A wireless charging receiving device, characterized in that the device comprises: at least one set of receiving coils, a compensation network group, a rectifier circuit, a switch component and a controller;

The compensation network group includes n sets of compensation networks, the n sets of compensation networks have at least one different in circuit topology or device configuration parameters, and the input ends of each set of compensation networks are connected to the output ends of the receiving coils, each An output of the group compensation network is coupled to an input of the rectifier circuit, the n being an integer greater than one;

The controller is configured to control the switch component to conduct one or more groups of the n sets of compensation networks with the receiving coil and the rectifying circuit to implement selection of different charging modes.
The apparatus according to claim 1, wherein the number of the at least one set of receiving coils is a group, each group comprising at least one coil, and the a is a positive integer;

1 ≤ a < n, there are at least two sets of compensation network inputs connected to the output of the same set of receiving coils;

or,

a = n, the input of each group of compensation networks is connected to the output of a group of receiving coils, and different compensation networks are connected to different receiving coils.
The apparatus according to claim 2, wherein said a group of receiving coils comprises a first receiving coil, and said first receiving coil is connected to a first compensation network of said n sets of compensation networks;

The first receiving coil is a single coil, and the first end and the second end of the first receiving coil are respectively connected to the input end of the first compensation network;

or,

The first receiving coil includes a first coil, a second coil, and a third coil, and the first end of the first coil and the second end of the third coil are connected to a first node, the first coil The second end and the first end of the second coil are connected to the second node, and the second end of the second coil is connected to the first end of the third coil to the third node, the first node, The second node and the third node are respectively connected to the input end of the first compensation network;

or,

The first receiving coil includes a first coil, a second coil, and a third coil, and the first end of the first coil, the first end of the second coil, and the first end of the third coil are connected to The same node, the second end of the first coil, the second end of the second coil, and the second end of the third coil are respectively connected to the input end of the first compensation network.
The apparatus according to any one of claims 1 to 3, wherein the number of the rectifying circuits is b group, and b is a positive integer;

1≤b<n, there are at least two sets of compensation network outputs connected to the input end of the same rectifier circuit;

or,

b = n, the output of each set of compensation networks is connected to the input of a set of rectifier circuits, and different compensation networks are connected to different rectifier circuits.
Apparatus according to any one of claims 1 to 4, wherein said apparatus further comprises a DC voltage conversion circuit, the input of said DC voltage conversion circuit being coupled to the output of said rectifier circuit.
The apparatus according to any one of claims 1 to 5, wherein the n sets of compensation networks include a second compensation network;

The second compensation network includes k compensation network elements that are connected in parallel with each other, and the k is an integer greater than one.
The device according to any one of claims 1 to 6, wherein the switch assembly includes a first switch;

The first switch is an electronic switch; or,

The first switch is a mechanical switch; or,

The first switch includes an electronic switch and a mechanical switch in parallel.
A wireless charging method, characterized in that, in the controller of the wireless charging receiving device according to any one of claims 1 to 7, the method comprises:

Obtain charging demand information;

Determining a charging mode to be activated according to the charging demand information;

Selecting, from the n sets of compensation networks, a first target compensation network corresponding to the charging mode to be enabled;

Controlling the switch component to conduct the first target compensation network with the receive coil and the rectifier circuit.
The method according to claim 8, wherein the determining the charging mode to be activated according to the charging demand information comprises:

Determining, in the preset correspondence, a charging mode corresponding to the charging demand information, the charging mode to be enabled, wherein the preset correspondence includes a correspondence between the charging demand information and the charging mode relationship.
The method according to claim 8 or 9, wherein after the controlling the switch component to turn on the first target compensation network and the receiving coil and the rectifying circuit, the method further comprises:

Determining the adjusted charging mode according to the state of charge;

Selecting, from the n sets of compensation networks, a second target compensation network corresponding to the adjusted charging mode;

Controlling the switch component to conduct the second target compensation network with the receive coil and the rectifier circuit.
An electric device, characterized in that the electric device comprises: a battery, and the wireless charging receiving device according to any one of claims 1 to 7.